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Topic: Arduino library for WTV020-SD-16P audio module (Read 144045 times) previous topic - next topic


Hey, thank you very much guys for your greetings. I am really pleased that my little piece of source code did something useful. I have been out of this forum but I am back. First of all, when you have a problem with this sound module, 90% of the times, blame the uSD card. IT is VERY pesky about them. Later, could be the wired, and If everything else did not work, just replace the module.

About the gap, It depends entirely on the software and the module. It seems that needs 20 [ms] to switch between tracks. That's the gap you heard. I have been trying to fix that, but seems impossible given the hardware. I also moved the pin from 3.3 to 5 in one of my modules ( I have 2 of them) and did not work. Put 2 diodes, as recommended and worked, but no so fine. Any other moved the pin and got fine results?


I can't find the zip file can give me that. :)


It is attached at the very first post. You have to be logged to see it.


Just let me know If you need anything else. Always a pleasure to help.

FAT formatted on windows 7
File is named 0.ad4, and located in the root directory

use the sd card formatter utility, and rename the file as 0000.ad4

first try to use the ad4 files that have been tested by others , it will help u

Malcom X

Hello, congratulations for the work.
You can select a track between the files on the sd.
Create a sort of mp3 trigger.

:) :) :)


Hey guys, anyone using it at 5V? Cause I moved the soldered pin from 3.3 to 5 and could not get it to work. Quite erratically. I did not use any diode cause I believe they are soldered in the pcb board. Any idea?


Posted a new library here http://arduino.cc/forum/index.php/topic,133013.new.html#new for an audio amplifier that works with this audio module.

I am running it on 5V supply without changing the jumper , and using 2 diodes.


I am running it on 5V supply without changing the jumper , and using 2 diodes.

So, your board is working fine, cause I tried that setup and could not make it work. Functionality was erratically.


You are abs right. Tried that with my two modules and did work. Maybe I tried that in the past with the defective one I had. Good!

Just a note in case anyone else tries this.

I bought one of these modules on eBay and following some instructions from someone on YouTube, I resoldered the jump link to set the voltage to 5V instead of 3.3V (there are 3 solder pads and you join 2 of them).

I did this because I could not get the module to make any sounds, even though the (busy) LED was flashing as if it was receiving commands etc.

Anyway. Following switching the module to 5V, it still didn't work, but when I tried to re-load the AD4 files, the SD card was no longer readable.

So it looks like the module may work on 5V, but not all SD cards (well not mine).
Hence I'd not advise anyone to try this unless the know their SD card is 5V tolerant.
Freelance web and iPhone app developer and Producer. Melbourne Australia


Well, I don't think any micro sd card works at 5V. So, basically If does not work, It is not weird. If you need your wtv working at 5V, interconnect the diodes 4007 and go back that soldered pin to 3.3v.


Here you have the wtv working at 5V with two diodes:


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